Saturday
July 12, 2014

Posts by Jen


Total # Posts: 3,270

chemistry
use standard enthalpies of formation to calculate delta Hrxn for the following reaction. 2H2S(g)+3O2(g)-->2H2O(l)+2SO2(g) express the answer using four significant figures Delta Hrxn = ? kJ

Stats....PLZ HELP....
A bag of colored blocks contains the following assortment of colors: red (18), blue (14), orange (20), purple (14), green (10), and yellow (4). Construct the probability distribution for x.

Stats
Find the mean and standard deviation of the following probability distribution: x 1 2 3 P(x) 0.3 0.5 0.2

Stats
x y 1 -10.0 2 -20.0 3 -30.0 4 -40.0 5 -50.0 - What would be the slope of this regression line? - Would the correlation between x and y be positive or negative? - How would you interpret these data in terms of linear regression?

Stats
In testing a new drug, researchers found that 10% of all patients using it will have a mild side effect. A random sample of 14 patients using the drug is selected. Find the probability that: (A) exactly two will have this mild side effect (B) at least three will have this mild...

math
Consider the experiment of simultaneously tossing a fair coin and rolling a fair die. Let X denote the number of heads showing on the coin and Y the number of spots showing on the die. a. List the outcomes in S. b. Find Fx,y(1,2). Part a is easy. It's part b that I don'...

eth
should united states government policy favor certain kinds of immigrants?

statistics
Seventy million pounds of trout are grown in the U.S. every year. Farm-raised trout contain an average of 32 grams of fat per pound, with a standard deviation of 7.5 grams of fat per pound. A random sample of 34 farm-raised trout is selected. The mean fat content for the sampl...

statistics
Seventy million pounds of trout are grown in the U.S. every year. Farm-raised trout contain an average of 32 grams of fat per pound, with a standard deviation of 7.5 grams of fat per pound. A random sample of 34 farm-raised trout is selected. The mean fat content for the sampl...

Math
You are given the following data. # of Absences Final Grade 0 96 1 92 2 71 3 66 4 60 5 51 A. Find the correlation coefficient for the data. B. Find the equation for the regression line for the data, and predict the final grade of a student who misses 3.5 days.

Math
Three cards are selected, one at a time from a standard deck of 52 cards. Let x represent the number of tens drawn in a set of 3 cards. (A) If this experiment is completed without replacement, explain why x is not a binomial random variable. (B) If this experiment is completed...

Math
A. If the correlation coefficient is 0.65, what is the sign of the slope of the regression line? B. As the correlation coefficient decreases from -0.97 to -0.99, do the points of the scatter plot move toward the regression line, or away from it?

Math
This is so confusing to me :( what would i do next??

Math
For the table that follows, answer the following questions: x y 1 1/2 2 1 3 3/2 4 - Would the correlation between x and y in the table above be positive or negative? - Find the missing value of y in the table. - How would the values of this table be interpreted in terms of lin...

Can somehelp me with this ASAP plz?!?!?! Stats
For a particular sample of 63 scores on a psychology exam, the following results were obtained. First quartile = 57 Third quartile = 87 Standard deviation = 9 Range = 51 Mean = 72 Median = 72 Mode = 98 Midrange = 57 I. What score was earned by more students than any other scor...

Stats
In each of the four examples listed below, one of the given variables is independent (x) and one of the given variables is dependent (y). Indicate in each case which variable is independent and which variable is dependent. I. Rainfall; Crop yield II. Taxi fare; Length of ride ...

Stats
For a particular sample of 63 scores on a psychology exam, the following results were obtained. First quartile = 57 Third quartile = 87 Standard deviation = 9 Range = 51 Mean = 72 Median = 72 Mode = 98 Midrange = 57 I. What score was earned by more students than any other scor...

Stats....how do i do this??
It doesn't show .16, it shows .15 as p-value of 0.4404 and z as 1.15....what do i do??

Stats....how do i do this??
SAT I scores around the nation tend to have a mean scale score around 500, a standard deviation of about 100 points, and are approximately normally distributed. What SAT I score within the population would have a percentile rank of approximately 16? Im not sure how to do this....

Stats...is this correct??
Scores on the Stanford-Binet Intelligence scale have a mean of 100 and a standard deviation of 16, and are presumed to be normally distributed. A person who scores 68 on this scale has what percentile rank within the population? z = (68-100)/16 z = -32/16 = -2 So would it be 9...

Stats...is this correct?
Yay!! Thank u!!

Stats...is this correct?
A sample of purchases at the local convenience store has resulted in the following sample data, where x = the number of items purchased per customer and f = the number of customers. x 1 2 3 4 5 f 5 15 8 8 7 1. What does the 15 stand for in the above table? 2. Find the midrange...

Stats
I. Dependent variable; Independent variable II. Independent variable; Independent variable III. Independent variable; Dependent variable IV. Dependent variable; Dependent variable Sorry I misread it. Is this correct?

Stats
6. In each of the four examples listed below, one of the given variables is independent (x) and one of the given variables is dependent (y). Indicate in each case which variable is independent and which variable is dependent. I. Rainfall; Crop yield II. Taxi fare; Length of ri...

Stats
For a particular sample of 63 scores on a psychology exam, the following results were obtained. First quartile = 57 Third quartile = 87 Standard deviation = 9 Range = 51 Mean = 72 Median = 72 Mode = 98 Midrange = 57 I. What score was earned by more students than any other scor...

CHEMISTRY HELP
1) The specific heat of solid copper is 0.385 J/g(C). What thermal energy change occurs when the temperature of a 34.10 g sample of copper is cooled from 35.7 degrees Celsius to 13.9 degrees Celsius? Answer: -286.3 J This amount of heat is used to melt solid ice at 0.0 degrees...

Statistics
SAT I scores around the nation tend to have a mean scale score around 500, a standard deviation of about 100 points, and are approximately normally distributed. What SAT I score within the population would have a percentile rank of approximately 16?

Statistics
It says to calculate using this: Nk/100 So im not sure if i did it correctly....

Statistics
z = (68-100)/16 z = -32/16 = -2 So would it be 95%?

Statistics
Scores on the Stanford-Binet Intelligence scale have a mean of 100 and a standard deviation of 16, and are presumed to be normally distributed. A person who scores 68 on this scale has what percentile rank within the population?

Statistics
So the midrange of items purchases would be 3. 5+30+24+32+35 = 126 items were purchased by the customers in this sample. Did i do this correctly?

Statistics
A sample of purchases at the local convenience store has resulted in the following sample data, where x = the number of items purchased per customer and f = the number of customers. x 1 2 3 4 5 f 5 15 8 8 7 •What does the 15 stand for in the above table? •Find the mi...

Statistics
I. dependent variable II. independent variable III. independent variable IV. dependent variable Is this correct?

Statistics
In each of the four examples listed below, one of the given variables is independent (x) and one of the given variables is dependent (y). Indicate in each case which variable is independent and which variable is dependent. I. Rainfall; Crop yield II. Taxi fare; Length of ride ...

Statistics
A student scored 81 percent on a test, and was in the 77th percentile. Explain these two numbers.

Statistics
In terms of the mean and standard deviation: -What does it mean to say that a particular value of x has a standard score of +2.1? -What does it mean to say that a particular value of x has a z-score of -2.4?

Stats
For a particular sample of 63 scores on a psychology exam, the following results were obtained. First quartile = 57 Third quartile = 87 Standard deviation = 9 Range = 51 Mean = 72 Median = 72 Mode = 98 Midrange = 57 Answer each of the following: I. What score was earned by mor...

math
A 1200·kg elevator is attached to a cable whose tension is 11900·N. What is the magnitude of the elevator's acceleration? ____ m/s

chemistry
what is the typical relationship between the rate of reaction and the value of the equilibrium constant? A) it is a direct porportionality B) it is an exponential proportionality C) it is an inverse proportionality D) there is no relationship between these factors

math
A ball is thrown from the edge of a cliff with an initial velocity of 60·m/s upward. Answer the following questions using + (upward) and - (downward) to indicate the direction of the velocity. Ignore air resistance and assume the ball does not hit the ground during the ...

physics
The hang-time of a basketball player who jumps a vertical distance of 2 feet (0.61 m) is about 0.70 second. What will be the hang-time if the player reaches the same height while jumping 3 feet (0.91 m) horizontally?

Stats
A set of 50 data values has a mean of 15 and a variance of 25. Find the standard score of a data value = 20. I'm not sure how to do this....please help

Help plz!! Math....
Start with x = 100 and add four x values to make a sample of five data such that the standard deviation of these data equals 0

Help plz!! Math....
A set of 50 data values has a mean of 15 and a variance of 25. Find the standard score of a data value = 20

Physics
A 4.3-kg block slides down an inclined plane that makes an angle of 26° with the horizontal. Starting from rest, the block slides a distance of 2.1 m in 5.1 s. Find the coefficient of kinetic friction between the block and plane.

sentence
I show my appreciation to my parents for all they do for me :)

4th grade math
add all of them and divide by how many sets there are which is 5.... 92 + 96 + 99 + 103 + 88 = 478/5 = 95.6

Statistics
Start with x = 100 and add four x values to make a sample of five data such that the standard deviation of these data equals 0

Statistics
A set of 50 data values has a mean of 15 and a variance of 25. Find the standard score of a data value = 20

Can someone help me please? MATH
hmmmmm i guess it is....thank u :)

Can someone help me please? MATH
Identify the sampling technique used to obtain this sample: Each person boarding a plane is asked to flip a coin; those showing “tails” have their luggage searched.

Math
interesting....thank you for your example, it definitely helped me :)

Math
In your own line of work, give one example of a discrete and one example of a continuous random variable, and describe why each is continuous or discrete.

Math
Identify the sampling technique used to obtain this sample: Each person boarding a plane is asked to flip a coin; those showing “tails” have their luggage searched.

Chemistry
I have no idea where to even start with this problem on my pre-lab! For part of the experiment, you will need to prepare 100 mL of 0.025 M CH3CO2H, starting from commercial "glacial" acetic acid, which has a concentration of 17.4 M. This is best done by making two di...

Math-Stats
An insecticide company exposes 10,000 cockroaches to its newest product, and exposes another 10,000 to their previous formula. The researchers use videotape to count how many cockroaches are still alive, and how many appear to be in distress, at 10 second intervals. When the t...

Math
actually i do check and actually that is another problem i posted, not this damn problem!

Math
Construct a grouped frequency distribution for the following 28 scores using a class width of 4: 64 63 58 46 52 62 47 49 56 47 43 41 45 51 60 62 51 61 50 55 56 53 54 58 48 48 58 46 How do I do this?

Math
A candidate for a political office claims that he will win the election. A poll is conducted, and 35 of 150 voters indicate that they will vote for the candidate, 100 voters indicate that they will vote for his opponent, and 15 voters are undecided. a. What is the population p...

Chemistry
Regular-strength chlorine bleach is a 5.25% solution of NaClO. how many milliliters of 0.02005 M sodium thiosulfate will be required to reach the equivalence point in the titration of a 1.000ml sample of Bleach by reacting the ClO- ions with I, then titrating the resulting I2 ...

Math...PLEASE HELP!!!!
A candidate for a political office claims that he will win the election. A poll is conducted, and 35 of 150 voters indicate that they will vote for the candidate, 100 voters indicate that they will vote for his opponent, and 15 voters are undecided. a. What is the population p...

Math
how in the world do i do this??

Math
Construct a grouped frequency distribution for the following 28 scores using a class width of 4: 64 63 58 46 52 62 47 49 56 47 43 41 45 51 60 62 51 61 50 55 56 53 54 58 48 48 58 46

Math
A candidate for a political office claims that he will win the election. A poll is conducted, and 35 of 150 voters indicate that they will vote for the candidate, 100 voters indicate that they will vote for his opponent, and 15 voters are undecided. a. What is the population p...

Math-Ms. Sue or Bob
Can either one of you help me with the math problems I asked? I really need help and do not understand how I would calculate the sample statistic and parameter population....

MATH
Construct a frequency distribution table to organize the following set of data: 16 23 24 23 24 20 15 16 21 15 16 19 17 15 23 16 18 19 20 19

MATH
I get -3 for all of those??

MATH
Construct a grouped frequency distribution for the following 28 scores using a class width of 4: 64 63 58 46 52 62 47 49 56 47 43 41 45 51 60 62 51 61 50 55 56 53 54 58 48 48 58 46

MATH
would this be right? the population parameter of interest is 45%? the value of the sample statistic is 50%??

MATH
I am still so confused....the population parameter of interest isn't 150? The value of the sample statistic isn't 100? I'm sorry I am so lost with Statistics...one of the hardest classes I've dealt with yet :( Please help me...

MATH
A candidate for a political office claims that he will win the election. A poll is conducted, and 35 of 150 voters indicate that they will vote for the candidate, 100 voters indicate that they will vote for his opponent, and 15 voters are undecided. a. What is the population p...

algebra 2
i need help with these questions simplify √4x^2/y^3 √2x^4/72 √18+√32 √31(√3+√27)

Math....please help
A candidate for a political office claims that he will win the election. A poll is conducted, and 35 of 150 voters indicate that they will vote for the candidate, 100 voters indicate that they will vote for his opponent, and 15 voters are undecided. a. What is the population p...

Statistics-confused
A candidate for a political office claims that he will win the election. A poll is conducted, and 35 of 150 voters indicate that they will vote for the candidate, 100 voters indicate that they will vote for his opponent, and 15 voters are undecided. a. What is the population p...

math
$50 + $15 + $3 = $68

Statistics-confused
A candidate for a political office claims that he will win the election. A poll is conducted, and 35 of 150 voters indicate that they will vote for the candidate, 100 voters indicate that they will vote for his opponent, and 15 voters are undecided. a. What is the population p...

Statistics
I think it's nominal correct?

Statistics
Classify the following variable as nominal, ordinal, discrete, or continuous and state why it is such a variable: number of US Senators

Statistics
Thank you.

Statistics
Yes....so it would be observational correct?

Statistics
Describe whether the following study would most likely be “observational” or “experimental”, and why it would be so. * Mystery shoppers monitor the preferences at a shopping mall

nursing
What are some processes for applying nurse-sensitive performance reviews and quality indicators? How can these processes be best implemented? What is their effect on nursing research and practice?

english
can you help me classify this sentence: The two blue birds trill merrily each morning. What would (each morning) be?

english
Can you help me with this sentence The two blue birds trill merrily each morning. article adj.-the adj-two adj-blue noun-birds verb-trill adv-merrily prep-each object of prep-morning is this right?

english
prep-on article adj- the object of the prep-swings adv.-during adv- recess

english
please help classify each word in this sentence: Several children played on the swings during recess.

nursing
How would you prevent misconduct in any reserach study

accounting
How do write this as a journal entry transaction? Alex transferred $17,000 from his personal bank account to the corporation in exchange for capital stock.

Physics
I know a steady force produces a steadily increasing velocity and a constant acceleration. But what happens when you increase the force by doubling or tripling it? I think the acceleration would follow force changes but what about velocity?

math
x^(2ln(x)-1) +e^1/9=(1+e^1/9) *x^(ln9x)-0.5)

statistics
12.27 A study has been carried out to compare the United Way contributions made by clerical workers from three local corporations. A sample of clerical workers has been randomly selected from each firm, and the dollar amounts of their contributions are as follows. (Use data fi...

Physics
A car accelerates from 0 to 60 miles per hour in 6.5 seconds. Determine the distance traveled in this time and the acceleration. Assume constant acceleration.

Science
If a block is 12cm wide, 7cm long and 9 cm then how much of the block will be below the surfaceof the water if the block weights 500 grams?

math
six cars are parked in front of a car dealership. If you are looking at the cars from the front. the red car is parked in front of the green car. the black car is between the green and the yellow car. The blue car is parked on the right side of the red car. the orange car is p...

Math
For the limit lim x → 3 (x3 − 2x + 5) = 26 illustrate the definition by finding the largest possible values of δ that correspond to ε = 0.2 and ε = 0.1. (Round your answers to four decimal places.)

Physics
Now would that also be the same visual for an observer? Or would it seem to them like the it's curving and fall on the rider?

Physics
I have a projectile motion question. If let's say a cannon which was placed on a moving cart with negligible friction projects a cannonball straight up in the air where will it fall? Would it be behind the cannon, on the rider or fall straight down back into the cannon? An...

english
identify the details in the story that contribute to a sense of reality and explain how these details make the story plausible.

english
score/ score presents a fictional world, regulated by computers and other machines in which humans are noticeably absent. Though the main characters are actually two computers that converse, the story contains several details that create verismilitude. Because computers are pr...

Literacy
Please check my work. Thank you. 1. Which of the following is the most direct tool to find books owned by a library you are visiting? A. W i k i p e d i a B. Search engines like G o o g l e or Y a h o o C. Catalog D. Periodical database Answer #1 is B 2. Which of the following...

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